Two Pattern Timing Tests Capturing Defect-Induced Multi-Gate Delay Impact of Shorts
Two Pattern Timing Tests Capturing Defect-Induced Multi-Gate Delay Impact of Shorts
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两种模式时序测试捕获缺陷引起的短路多栅极延迟影响
DOI:
10.1109/vts50974.2021.9441005
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Chatterjee, Abhijit
中科院分区:
文献类型:
--
作者:
Pandey, Sujay;Liao, Zhiwei;Nandi, Shreyas;Natarajan, Suriyaprakash;Sinha, Arani;Singh, Adit;Chatterjee, Abhijit
Achieving high yield in deep-submicron technologies is challenging due to the presence of unforeseen defect mechanisms, requiring increases in test complexity and efficiency. We focus on shorts within standard cells which are traditionally targeted by DC tests. Recent research has shown the need for multi-pattern tests where intermediate defect resistance values are concerned, as opposed to extreme values considered by prevalent test techniques. In this research, we show that there exist ranges of short defect resistance values that escape traditional DC tests while incurring unexpectedly large delay values for specific two-pattern stimuli. It is seen that these resistance values are approximately in the range of defect resistance values observed for realistic short defects in industry. These defects must therefore be prioritized from a circuit level critical path delay testing perspective to minimize overall circuit DPPM. Such catastrophic increase in delay is due to the fact that specific shorts in standard cells influence the delays of logic gates feeding into and out of the standard cell, resulting in path delay increase of 50X-SOX with respect to the delay of a single cell. Two-pattern tests are derived for such faults and simulation results on standard cell designs and ripple carry adders are presented to further our arguments.
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